What is cellular technology
The Chinese meaning of Cellular is "cellular (technology)", which is a wireless communication technology. This technology divides a geographical area into several cells, called "cells" (ie Cells). Cellular technology is so named. Mobile phones (or mobile phones) all use this technology, so they are often referred to as cellular phones. The purpose of dividing a large geographic area into multiple "cells" is to make full use of the limited wireless transmission frequency. Each group of connections (for wireless telephones, each group of sessions) requires a dedicated frequency, and there are only about 1,000 available frequencies. In order to allow more conversations to proceed simultaneously, the cellular system allocates a certain amount of frequency to each "cell" (ie, each small area). Different cells can use the same frequency, so that limited wireless resources can be fully utilized. Common cellular systems include GSM and CDMA, which are all second-generation communication technologies.
Circular Emergency Ceiling Light is according to the type can be divided into maintenance or non-maintenance . It is made of solid polycarbonate material , with protection rating of IP65 , suitable for indoor and outdoor use . It comes with a premium rechargeable lithium-ion battery with automatic monthly and annual detection .
Emergency Ceiling Light
Emergency Light Ceiling,Industrial Emergency Light,Led Emergency Ceiling Lights,Ceiling Mounted Emergency Lights
Jiangmen City Pengjiang District Qihui Lighting Electrical Appliances Co., Ltd , https://www.qihuilights.com